CN112030646A - Granular pile construction process for treating highway diseases - Google Patents

Abstract

The invention belongs to the technical field of highway pavement construction, and provides a construction process for granular piles for treating highway diseases, comprising the following steps: A, measuring and setting out; B, drilling; C, mixing; Mixed with sand and gravel, the weight ratio of cement:sand:stone:additives is 1:4:1:0.01, and after mixing, it forms granules; D. Backfilling; quantitatively backfill the mixed granules into the hole layer by layer, The backfill thickness is 50-100cm, E, ram and expand into piles; use a rammer to compact the aggregates layer by layer; F, seal the hole; use cement concrete to seal the hole to the level of the road surface; G, level the road surface; Asphalt concrete is laid on the pavement with a long length to make the subsidence pavement smooth with other pavements; H. Inspection; after the construction is completed, set up settlement observation points on the cross section of the pavement, and observe it once every 24 hours through a level gauge, which solves the problem of existing road construction. The road needs to be completely closed, which seriously affects the drawbacks of the road opening to traffic.

Description

A construction technology of granular piles for treating road diseases

technical field

The present invention relates to the technical field of highway pavement construction, in particular, to a construction technique of aggregate piles for treating highway diseases.

Background technique

With the continuous development of urbanization, the mileage of expressways continues to increase; however, various diseases also appear with the increase of traffic time, among which road subsidence is the most common disease in roadbed fill sections. One, the subsidence is severe or even partially accompanied by severe longitudinal cracks, which seriously affects the driving safety and the safe operation of the road.

In the cement aggregate pile composite roadbed, the cement aggregate pile plays the role of vertical reinforcement, and its strength directly determines the bearing capacity of the composite foundation. Cement aggregate piles are mainly used to treat subsidence sections of subgrade with high water content and crushed stone content of ≤ 30% and mainly soil quality. By compacting the subgrade, a composite subgrade is formed to improve the overall strength of the subgrade.

Cement granule compaction piles are used to treat settlement sections. The gravel content in the fill subgrade should be less than 20%-30%, the water content should be greater than 15%, and the soil body should be in a soft plastic-plastic state. In the process of road maintenance and construction, the existing construction method has a large working radius, and the road needs to be completely closed, which seriously affects the road opening.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome the deficiencies of the above-mentioned traditional techniques, provide a kind of construction technology of granular piles for treating road diseases, solve the drawbacks that existing road construction needs to completely close the road and seriously affect the road opening to traffic.

The technical scheme of the present invention is:

A construction technique of granular piles for treating road diseases, comprising the following steps:

A. Measure the stakeout; calculate the hole spacing according to the void ratio and water content, and arrange the hole positions according to the calculation;

B. Drilling; according to the measured pile position, align the center of the drill tip with the midpoint of the pile position, and adjust the level of the drill rig and the verticality of the drill pipe through the double-sided indicator hanging on the side of the drill pipe guide frame;

C. Mixing; pass the sand through a sieve, mix the cement and the sand, and the weight ratio of cement:sand:stone:additive is 1:4:1:0.01, and it forms granules after mixing;

D. Backfilling: quantitatively backfill the mixed pellets into the hole layer by layer, and the backfill thickness is 50-100cm.

E. Consolidate and expand into piles; use rammers to compact the aggregates layer by layer, while compacting and compacting, the aggregates expand horizontally, and finally form a pile body larger than the diameter of the opening.

F. Seal the hole; use cement concrete to seal the hole to the level of the road surface;

G. Pavement leveling; paving asphalt concrete on the pavement with a certain length of subsidence to make the subsidence pavement smoothly connect with other pavements;

H. Detection: After the construction is completed, set up settlement observation points on the cross section of the pavement, and observe once every 24 hours through the leveling instrument.

As a preferred technical solution, the allowable deviation of the verticality in step B is less than 1%.

As a preferred technical solution, the mixing in step C adopts manual mixing, and the mixing times are 3 times

The concrete is mixed by manual mixing. During the mixing process, before adding water, 2-3 shovels are used to turn the cement and sand and gravel materials in opposite directions. 3 times to make the dry ingredients uniform, then add water, and turn them in opposite directions 4 times to ensure that the mixed mixture is saturated and not trapped.

As a kind of preferred technical scheme, in step C, mixing adopts forced concrete mixer mechanical mixing, and mixing time is 3 minutes.

Mixing concrete with a forced concrete mixer can speed up the discharge speed, make the mixing more thorough, and also have the advantage of reducing mud leakage.

As a kind of preferred technical scheme, in step E, the weight of using rammer is 180-240kg, and the height of drop weight is 2-3 meters, and every layer of granular material is tamped by 10-15 hammers. While compacting and compacting, the pellets expand horizontally, eventually forming a pile body larger than the diameter of the opening.

As a preferred technical solution, the weight of the rammer used in step E is 180kg, and the height of the drop hammer is 2 meters. The standard for the termination of ramming of each layer is that the settlement amount is less than 2cm for 3 consecutive times.

As a preferred technical solution, in step F, the cement concrete adopts C30 cement concrete.

As a preferred technical solution, in step D, the total amount of backfill and compaction of the pellets is 2-5 times of the volume in the pores.

As a preferred technical solution, in step E, backfill to a distance of 100 cm from the orifice, and stop the operation.

The present invention has the following advantages due to the adoption of the above technical solutions: in the drilling step, the hole diameter of the drilled hole is only 14 cm, and the damage to the pavement structure in the construction section is small; The material is compacted and expanded horizontally, and finally a pile body larger than the diameter of the opening is formed, which improves the treatment of the road surface; in the step of ramming the pile, the weight of the rammer is 180-240kg, which will not cause damage to the road structure layer. , uplift and loose soil between two adjacent aggregate piles; flexible construction equipment, no need to completely seal the road, and will not affect the passage of the road.

The present invention will be further described below in conjunction with specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the implementations. example.

In the description of this technical solution, it should be understood that the terms "center", "portrait", "horizontal", "front", "rear", "left", "right", "vertical" and "horizontal" , "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than merely indicating or implying that the indicated device or element must have a specific The orientation, construction and operation in a specific orientation should not be construed as limiting the protection scope of the present invention, and the present invention will be further described below.

Embodiment 1: a kind of construction technology of granule pile for treating road diseases, comprising the following steps:

A. Measure and stake out; arrange the pile position plan according to the design and construction drawing; measure and place the point position of the aggregate pile, and mark the point position to determine the depth of the pile bottom relative to the ground;

B. Drilling; according to the measured pile position, align the center of the drill point of the drilling rig with the midpoint of the pile position, and adjust the level of the drilling rig and the verticality of the drill pipe through the double-sided indicator hanging on the side of the drill pipe guide frame; During the process, before each pile is constructed, technicians will check the pile position and verticality, and then start drilling after meeting the requirements. Observe the double-sided indicator at any time to ensure that the drilling rig is not skewed.

C. Mixing; pass the sand through a sieve, mix the cement and the sand, and the weight ratio of cement:sand:stone:additive is 1:4:1:0.01, and it forms granules after mixing;

D. Backfilling; quantitatively backfill the mixed granules layer by layer into the hole, and the backfill thickness is 50-100cm;

E. Ramming and expanding into piles; using rammers to compact the aggregates layer by layer; while compacting and compacting, the aggregates expand horizontally, and finally form a pile larger than the hole diameter.

F. Seal the hole; use cement concrete to seal the hole to the level of the road surface;

G. Pavement leveling; paving asphalt concrete on the pavement subsided for a certain length to make the subsidence pavement and other sections of pavement connect smoothly;

H. Detection: After the construction is completed, set up settlement observation points on the cross section of the road surface, and observe once every 12 hours through the leveling instrument.

The tolerance for squareness in step B is less than 1%. During the drilling process of the rig, observe the double-sided indicator at any time to ensure that the rig is not deflected.

In step C, manual mixing is used for mixing, and the mixing frequency is 3 times.

In the process of manual mixing, before the concrete is mixed without adding water, 2-3 shovels are used to turn the cement and sand and gravel materials in opposite directions. Add water and turn 4 times to ensure that the mixture is saturated and not smothered.

In step E, the weight of the rammer used is 180kg, the height of the drop weight is 2 meters, and each layer of granular material is tamped with 10-15 rams until the settlement amount is less than 2cm for 3 consecutive times of tamping. Stop ramming.

In step F, the cement concrete adopts C30 cement concrete.

In step D, the total amount of pellet backfill is 2-5 times the volume in the pores.

In step E, backfill to 100cm away from the orifice, and stop the operation.

In step C, the mesh size of the sieve is not greater than 5mm.

Embodiment 2: a kind of construction technology of granule pile for treating road diseases, comprising the following steps:

A. Measure and stake out; arrange the pile position plan according to the design and construction drawing; measure and place the point position of the aggregate pile, mark the point position, and determine the depth of the pile bottom relative to the ground;

B. Drilling; according to the measured pile position, align the center of the drill point of the drilling rig with the midpoint of the pile position, and adjust the level of the drilling rig and the verticality of the drill pipe through the double-sided indicator hanging on the side of the drill pipe guide frame; During the process, before the construction of each pile, technicians will check the pile position and verticality, and then start drilling after meeting the requirements. Observe the double-sided indicator at any time to ensure that the drilling rig is not skewed.

C. Mixing; pass the sand through a sieve, mix the cement and the sand, and the weight ratio of cement:sand:stone:additive is 1:4:1:0.01, and it forms granules after mixing;

D. Backfilling: quantitatively backfill the mixed pellets into the hole layer by layer, and the backfill thickness is 50-100cm.

E. Ramming and expanding into piles; use rammers to compact the aggregates layer by layer;

F. Seal the hole; use cement concrete to seal the hole to the level of the road surface;

G. Pavement leveling; paving asphalt concrete on the pavement subsided for a certain length to make the subsidence pavement level with other pavements;

H. Detection: After the construction is completed, set up settlement observation points on the cross section of the pavement, and observe once every 24 hours through the leveling instrument.

The tolerance for squareness in step B is less than 1%.

In step C, a forced concrete mixer is used for mechanical mixing, and the mixing time is 3 minutes. The forced concrete mixing machine has a cross shaft assembly connected between the mixing shovel and the rotating arm, and the working gap of the mixing shovel is controlled by a tie rod or a screw, which can prevent the hard materials from sticking, so as to reduce the running resistance and reduce wear and tear. . Since the angle between the working surface of the mixing shovel and the advancing direction is an obtuse angle in the vertical and horizontal directions, the mixing effect can be enhanced and the mixing quality can be improved. Through the discharge port on the side wall of the barrel, the barrel can swing laterally relative to the frame, and a cleaning scraper is provided, which can speed up the discharge and make it more thorough, and also has the advantage of reducing mud leakage.

In step E, the weight of the rammer used is 240kg, the height of the drop weight is 3 meters, and each layer of granular material is tamped with 15 rams. Until the ramming settlement amount is less than 2cm for 3 consecutive times. Stop ramming.

For cement granules, in addition to dry density, water content is also a major factor that affects its strength. The water content is higher than the optimum water content, which has a great influence on its strength. Therefore, during construction, the water content of the filler should be as close as possible. The optimum water content, therefore, the weight of the rammer used in step E is 180kg, and the height of the drop hammer is 2 meters.

In step F, the cement concrete adopts C30 cement concrete.

In step D, the total amount of pellet backfill is 2-5 times the volume in the pores.

In step E, backfill to 100cm away from the orifice, and stop the operation.

In step C, the mesh size of the sieve is not greater than 5mm.

The above embodiments are only used to illustrate the technical solutions of the present invention, but the present invention is not limited to this embodiment. Within the scope of knowledge possessed by those skilled in the art, and without departing from the spirit of the present invention, it is also possible to make various changes. Various transformations made by those skilled in the art from the above-mentioned concept without creative work all fall within the protection scope of the present invention.

Claims (9)

1. A granular pile construction process for treating highway diseases is characterized by comprising the following steps:

A. measuring and lofting; calculating hole site intervals according to the pore ratio and the water content, and arranging hole sites according to the calculation; measuring the point position of the granular material pile, and marking the point position to determine the depth of the pile bottom relative to the ground;

B. drilling; aligning the center of the drill point of the drilling machine to the midpoint of the pile position according to the measured pile position, and adjusting the level of the drilling machine and the verticality of the drill rod through a double-sided indicator hung on the side surface of the drill rod guide frame;

C. mixing; screening the sand material, mixing cement and sand material, and mixing cement: sand: stone: the weight ratio of the additive is 1: 4: 1: 0.01, mixing to form a mixture;

D. backfilling; the mixed granules are quantitatively backfilled into the holes layer by layer, the backfilling thickness is 50-100cm,

E. tamping and expanding to form a pile; tamping the granular materials layer by using a tamping hammer; the pile can be horizontally expanded while being tamped to be compact, and finally a pile with a diameter larger than the aperture is formed;

F. sealing holes; sealing holes with cement concrete until the pavement is level;

G. leveling a road surface; paving asphalt concrete on the pavement with a certain length of subsidence of the pavement to enable the subsidence pavement to be smoothly connected with other pavements;

H. detecting; after construction is finished, settlement observation points are arranged on the cross section of the road surface, and observation is carried out once every 24 hours by the level gauge.

2. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: the tolerance of the verticality in step B is less than 1%.

3. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: and C, manually stirring the mixture for 3 times.

4. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: and C, mechanically stirring by adopting a forced concrete stirrer for 3 minutes.

5. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: in the step E, the weight of a rammer is 180-240kg, the drop height of the rammer is 2-3 m, and each layer of the aggregates is tamped by 10-15 hammers.

6. The granular pile construction process for treating the road diseases as claimed in claim 5, wherein the granular pile construction process comprises the following steps: in the step E, the weight of the rammer used is 180kg, and the height of the drop hammer is 2 meters.

7. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: in the step F, C30 cement concrete is adopted as the cement concrete.

8. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: in the step D, the total backfilling amount of the granules is 2-5 times of the volume in the pores.

9. The granular pile construction process for treating the road diseases according to claim 1, which is characterized in that: and E, backfilling to a position 100cm away from the hole, and stopping operation.